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Oct. 1.13, 1925.

H. B. NELSON GRINDING S1153 Film; May 29, 1922 I TY'OR N15 Y fiitenied Quiz. 13', 1925.

Uill lhill rlircur ii-ENDING HUM,

Applicnldon filed na /2s, wee. her-m1 no. mm.

TOJIZ/ "]1073'0 2'! may comp/1n:

Be it known that l, HARRY Bu l lnis'in, n ciiizen ol the fniled Stones. residing at Saginaw in the county of Saginaw and State of hi cnignii. have invented certain new and useful ln'iprovements ill Grinding lSurrs; and l do hereby declare the following to he 21 roll, clear, and exact description of ihe inv nticn, such as will enable fliers skilled. in the art towliich it appertcins to make and use the same. k

This invention relates to grinding niachines and pertains more particularly to rho; cf of Grinders known as disk grindin w l in near the center sci; face in face.

no ion takes place between oi rui hc us formed on the opposing fuces'o'f thccuscs. he outer surfaces 01 the ribs on each dish being machined to the same height. the cutting or grinding edges of all of the projections on the. disk lie in the same plane and accurately meet lilie Working faces of the proj sci ions on the. opposing disk.

My invention perlonins more particularly ho en im inoved combination and arrangement of the sets-of shearing laces or bailloe on each disk whereby the ohjccis of my invention are attained.

Tl'icse ohjocis are. first. lo provide on a grinder disk a plurality of groups on -cm:- king; or g'iii'iding projections each group occupying a certain portion, one-sixlh of the working! area of the'dislc and he projections and hafies comprising each group arranged-lo guide the material in its out ward lllflWil across the working surface of ihe: dish in such n manner thalwhile travelling outwardly the material will he repeatedcut and recur. by shearing action or the working edges of the prrfiections and her Tho arrangement and relative ungulnr locations of projections are such that whcn duplicate disks made according ho my improved construction are placed face. to face the groups or projecrions and most of rho i'i'uflividnal projections comprising each group. will ioe direcicd 'clockwisc on one o? the disks and counterclockwise on fit-he opposing: disk. The nrrnngonicni cl each. group and. that of its component projections heing in general spiral; rssults an improved new function of the machine which will now he described.

This new iiicle of tho material to be subjected to repealed shearing actions and to cause such shearing action to occur whenever the "pari'iclc in its outward travel encounters any one of the numerous bullies or projections comprising one of the unit groups above described- I i To um end. I so arrange the guiding projecliions an d the bullies between them that when duplicate disks operate together, one of them siazzrionnry and the other revolving ul' high spared" the material will be driven from the center of the annulus to its pelriphcry nnd wyl'ieiiever in its uavei a bafile or projccl'ion on one of the disks is encountered, ihe material will immediately be caught with a scissorliltc" movement by one o1 i'he projections on the other disk and the part"; i8; of material will be sheared in two, instond of being merely rolled around and finally driven out on the periphery of the disks in a partially cutcondition as herecofore. requiring a second passage through the marching.

I have found in practice that the improved arrangement-of baffles and projeo tions herein described requires less power function is to cause each perfor :1 much nronler liourlv output than is required with former hufiie and projection arrangements in which the shearing action shove referred to is nol' attained in so (our pleic a measure. owing: to the relatively small amount of shearing action that takes place.

My arrangement of ballles whereby the material is made to travel outwardly in a substantially spiral direction and is subjected 'lTO shearing action of an oppositely direcled spiral system immediately it comes in contact with one of the projections is, therefore. an improved feature of my invention which comprises the devices herein described and claimed and the equivalents thereof.

lo the drawings Fig. 1 is n face view of.

As learl shown in "the drawings. each annular disk which in general construction is the same as is usually employed in disk grinding machines, carries on its working face a plurality of units, preferably six, each comprising a group of projecting members, the top surfaces of which .are ground off to the same level, so that the edges of the projections comprise shearing edges when two similar disks are placed face to face, one of the disks being stationary and the other revolved, or, if preferred, both disks may be rev'olved'in opposite directions, or both may be revolved in the same direction,'but one faster than theother. Considering any one group, as for ample, that included by the are A on the outer circumference of the annular disk, and the corresponding inner are as B, on the inner circumference, it will be noticed that the group is disposed in general in a some- What fanlike formation. theapex being at. C, one side bounded by the spirally curved row of projections 1, 2, 3, 4, 5 and the other side formed by a row ,6, 7, 8, 9,10. Between these two-outer rows of projections and arranged so as to equally divide the intervening area into spirally disposed sectors are other rows of projections, as for example, a central row 11, 12, 13, 1%, 15 and two flanking rows as 16, 17, l8, 19. If three intermediate rows are used, as herein illustrated, four spirally disposed channels or passage ways are thereby established, as 20, 2], 22, 23, which channels I have designated for convenience on one of the other unit groups.

In each channel a plurality of projectionsare located, which for convenience I designate' as ba'iiies 24, 25, 26, 27. extending, diagonally across their spiral channel and lying in a position substantially radial with respect to the a pex C as a. center.

Any one of the baflles'may; be made either in a single piece, as 24%, or in more than one piece, as at 25.

Considering now the operation of these projections reference may be had to 2, where the dotted lines show the positions of the projections on the second plate with respect to those on the first plate. The relative aimcrnent of the plates in opposite directioi'is, that is, the plate or disk shown in full lines may be stationary and the one indicated by dotted lines. may be revolved countor-clockwise, or the first may be revolved clockwise and" the second plate counter-clockwise, or both plates may be revolved in the same direction, but at different Speeds. I prefer, however, to follow the usual practice in grinding machines of this character, and employ one stationary plate and one revolving plate.

Material is fed. as indicated by the arrows in Fig. 2, into the space between projections l and 6, which are in eilcct outstanding ribs carried by the annular disk. The material is swept into the space between the dish; by the spirally arranged advancing projections 5 on the opposite plate,,the movement being substantially that of a, sweep or scraper, or' of a crumb tray on a table cloth and the effect being to drive the material in a general outward direction and at the same time subject it to the shearing action of the baiiles on the opposing plates. The bafllcs are oppositely directe as shown in Fig. 2, 7 that is to say, the spiral arrangement of bafties on one: plate is opposed in direction to i that of the baflies on the opposing plate.

As the material progresses outward across the annular working face of the disk and as it becomes cut into finer and liner particles the volume increases. Likew se the spread or distance apart of the rows of batlles, or in other words. the width of the channel, as 2i), increases. 7 The velocity of the material outward thereby maintained substantially constant,although the volume of the material increases it travels across the face of theannular disk.

By the means above described I have produced a simple, yet exceedingly effective 51 rangemcnt of batlles and spirals, whereb the shearing or cutting capacity of the disks is greatly increased and the power required for cutting is i'et'luced while the output of the machine is in practice almost doubled as compared with the output of disks havinggroups of ba'tlles arranged parallel.

Having thus (lQSCIllJGCl my invention. what 1' claim and desire to secure by Letters Pill? cut is:

In a grinding disk, spirally disposed longitudinally interrupted ribs including channels therebetween, a plurality of series of baflles located in and extending diagonah 1y across each of said channels, the individual bafiies of each series spaced apart endwise from each other and positioned substan-- tially radially with respect to the apex of said spiral channel as a center.-

Ii! testimony whereof, I affix my signatur.. I

HARRY B. NELSON-L- 

